Insert pump for wells



Aug. 6, 1957 N. N. KNABE Erm. 2,801,595

INSERT PUMP FOR WELLS Filed NOV. 16, 1955 TTOEA/EYS.

United lNsnnT PUMP Fon WELLS Norbert Nick Knabe, .lohn A. Knabe, and Thomas J. Knabe, Muenster, Tex.

Appiication November 16, 1956, Serial No. 622,699

4 Claims. (Cl. 10S-158) `the entire pump to be pulled from a well casing in a well bore in order that the various foreign matter may be removed, such as scale, corrosion and the like, and for the further purpose of replacing the pump cups. This procedure of pulling the pump is very expensive, time consuming and generally is a condition which the present invention tendsy to obviate.

A primary object of invention is to provide in an insert pump of the character utilized in oil well casings or the Ilike an attachment wherein a relatively small amount of foreign matter etc. is permitted to come in contact with the reciprocatory portions of said pump prolonging the life of the pump cups and keeping the intervals of pulling the pump for maintenance purposes down to a minimum.

Another object of invention in conformance with that set forth is to provide in an insert pump of the character involved a novel attachment which causes the iluid being pumped to leave the pump in a substantially circular path tending to reduce the accumulation of corrosion and the like on the inner surface of a well casing within which the pump is disposed accordingly prolonging the interval between periodic overhauls of the pump.

And a still further object of invention in conformance with that set forth is to provide an attachment for an insert pump which is readily and economically manufactured, easily installed and maintained, and highly satisfactory and practical for the purpose intended.

These together with other objects and advantages which will subsequently become apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure l is a vertical section through the novel insert pump of the invention showing the same in its installed position in a conventional weil casing;

Figure 2 is a section taken substantially on the plane of line 2 2 of Figure 1 and i Figure 3 is a section taken substantially on the plane of line 3-3 of Figure l.

Referring to the drawing in detail, a fragmentary portion of a well casing is indicated generally at 10, said well casing being disposed in a well bore and extending below the surface of a body of fluid F to be pumped upwardly through the well casing. Indicated generally at 12 is an insert pump comprising a lower body member 14, an upper shell member 16 and an intermediate body member ltates Patent O 18 comprising the attachment utilized with conventional insert pumps.

The lower body member 14 is substantially elongated incorporating about the outer periphery thereof sealing cups indicated generally at 20 which sealingly engage the innerperiphery of a lower portion of the well casing 10 and also retain the body member 14 against fixed relative movement with respect to the well casing. The lower end 22 ofthe body member 14 is disposed beneath the surface of the body of iluid F. The upper end of the body member 14 terminates in a reduced diameter externally threaded portion 24 for a purpose to subsequently be described in detail. Extending longitudinally through the body member 1 4 and opening into the lower end thereof is a longitudinal bore portion 26 terminating in an annular valve seat 28 which communicates with an enlarged recess portion 3l) in the upper end of body member 14.

The shell member `16 is of a smaller diameter than the internal diameter of the well casing and incorporates a closed upper end 32 terminating in a longitudinally extending externally threaded connecting nipple portion 34 connectable to a suitable coupling 36 comprising a lower portion of a force-transmitting rod which will extend the` length of thewell casing to the surface of the ground thereabove as is conventional in the art. Extending transversely of the inner periphery of the shell member 16 is a piston 38 incorporating about the: outer periphery `thereof a suitable sealing cup assembly indicated generally at 40. The piston 38 denes in the upper end of the shell member 16 a variable volume chamber 42. The piston 38 has extending therethrough a bore portion 44 receiving therethrough a reduced diametered portion of a tubular rod 46 the upper end portion of which being externally threaded and` receiving `thereon a suitable clamping nut 48. The lower end of the shell member 16 is internally threaded as indicated at Si) `andreceives therein a bushing member 52 transversely apertured at 54 for receiving an intermediate portion of the rod 46 therethrough. The bore portion 56 of the rod 46 accordingly communicates with the variable volume chamber 42 and upon upward movement of the shell member 16 relative to the piston 3S, a negative pressure will be created within the variable volume chamber 42 accordingly, as will subsequently become apparent, causing fluid to be drawn upwardly within the recess 30 of body member 14, and into the variable volume chamber 42. The lower end of the tubular rod 46 is externally threaded as indicated at 58 for a purpose to subsequently become apparent.

The intermediate body member 18 incorporates an internally threaded lower ange portion 60 removably received on the reduced diametered externally threaded portion `24 of body member 14. Extending longitudinally of the body member 18 is a irst longitudinal bore portion 62 terminating in an upper increased diameter internally threaded portion @receiving therein the lower threaded end 58 of the tubular rod 46. The body member 18 incor* porates a second longitudinally extending bore portion 66 extending in angular upwardly extending relationship relative to the longitudinal axis of the body member 18 wherein fluid passing upwardly therethrough will be cast toward the outer periphery of the well casing 10 and accordingly cause a swirling action'therein reducing the accumulation of contamination on the inner periphery of said well casing. The bore portion 66 terminates in an increased diametered tapered portion 68 having disposed therein a suitable valve element cage 70. The lower end of the tapered portion 68 continues with a uniform diametered portion 72 terminating at its lower end in an internally threaded portion "74 receiving therein a transversely aperta@ blbhtlg glement 7 6 insolroratins an upper `valve seat portion 78. A valve element 80 normally seats on the valve seat portion 78 and constitutes a one-way valve permitting fluid to pass from the recess 3() upwardly through the longitudinal bore portion 66. The valve seat `28 previously mentioned has a valve element 82 disposed thereon and accordingly constitutes a one-Way Valve permitting fluid to pass up through the bore 26 into the longitudinal bore 62, thence through the tubular rod 46 and into the variable volume chamber 42 upon an upward movement of the shell 16 as previously mentioned. Downward-movement of the shell 16 after fluid has been drawn into the variable volume chamber 42 results in decreasing the size of the variable volume chamber 42 and accordingly urging uid downwardly through the rod 46, through bore portion 62, past the valve element 80 and upwardly through the bore portion 66 and accordingly about the outer periphery` of the shell 16 and thence upwardly in `modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope lof the appended claims.

What is claimed as new is as follows:

l. In a iiuid pump for oil wells and the like for use in a well casing comprising a body member including a lower end portion insertable into a body of fluid to be pumped through the well casing, peripheral sealing cups yabout the outer periphery of the body member for retaining the body member in a fixed position relative to a well casing in which it is used and preventing the move; ment of fluid thereby, a longitudinal bore in the body member opening into the lower end thereof, said bore terminating in an enlarged recess at the upper end, a valve seat at the juncture between said bore and recess, a valve element sealingly received on the valve seat permitting one-way flow of uid through the bore into said recess; a pumping shell including a closed upper end including means engageable with means for reciprocating said shell above the body member, `a piston sealingly engaging the inner periphery of the shell and defining a variable volume chamber in the upper end thereof, a tubular rod extending through said piston and communicating with the Variable volume chamber, said rod being fxedly secured to said piston; and an attachment including a body member secured at opposite ends between the upper end of the iirst mentioned body member and lower end of the tubular rod, a longitudinal bore portion in the second mentioned body member communicating with the recess in which the valve element is disposed wherein upward movement of the shell increases the chamber size in the shell and draws fluid therein, a second longitudinal bore portion in the second mentioned body member terminating in a lower recess overlying the first mentioned recess, a one-way valve assembly in the second mentioned recess permitting iiuid ow from the first mentioned recess to the second mentioned recess due to downward movement of the shell wherein downward movement of the shell urges fluid out of the second longitudinal bore in the second mentioned body member for movement in the well casing exteriorly of said shell.

2. In a fluid pump for oil wells and the like for use in a well casing comprising a body member including a lower end portion insertable into la body of fluid to be pumped through the well casing, peripheral sealing cups about the outer periphery of the body member for retaining the body member in a lixed'position relative to a well casing in which it is used and preventing the movement of fluid thereby, a longitudinal bore in the body member opening into the lower end thereof, said bore terminating in an enlarged recess at the upper end, a valve seat at the juncture between said bore and recess, a valve element sealingly received on the valve seat permitting one-way flow of huid through the bore into said recess; a pumping shell including a closed upper end including means engageable with means for reciprocating said shell above the body member, a piston sealingly engaging the inner periphery of the shell and defining 4a variable Volume chamber in the upper end thereof, a tubular rod extending through said piston and communicating with the variable volume chamber, said rod being xedly secured to said piston; and an attachment including a body member secured at opposite ends between the upper end of the first mentioned body member and lower end of the tubular rod, a longitudinal bore portion in the second mentioned body member communicating with the recess in which the valve element is disposed wherein upward movement of the shell increases the chamber size in the shell and draws fluid therein, a second longitudinal bore portion in the second mentioned body member terminating in a lower recess overlying the first mentioned recess, a oneway valve assembly in the second mentioned recess permitting Huid flow from the first mentioned recess to the second mentioned recess due to downward movement of the shell wherein downward movement of the shell urges fluid out of the second longitudinal bore in the second mentioned body member for movement in the Wall casing exteriorly of said shell, lthe second longitudinal bore in the second mentioned body member extending upwardly in angular relationship relative to the longitudinal axis of said second body member for causing `an upward swirling action to fluid being pumped through the well casing.

3. In a uid pump for oil wells and the like for use in a well casing comprising a body member including a lower end portion insertable into a body of uid to be pumped through the well casing, sealing-cup means on the body member for retaining the same in a fixed and sealed position relative to the well casing in which it operates, a bore portion opening longitudinally through the body member, valve means at the upper end of the bore portion permitting one-way flow of fluid through the `bore portion; a pumping shell including a closed upper end including means engageable with means for reciprocating said shell above the body member, a piston sealingly engaging the inner periphery of the shell and defining a variable volume chamber thereabove, a tubular rod depending from said piston and communicating with the variable volume chamber; and an attachment including a body member secured at opposite ends between the upper end of the first mentioned body member and lower end of the tubular rod, a longitudinal bore portion in the second mentioned body member communicating with the bore portion of the first mentioned body member above the valve means wherein upward movement of the shell increases the variable volume chamber in the shell and draws fluid therein, a second longitudinal bore in the second mentioned body member terminating in a lower recess overlying the valve means of the rst mentioned body member, a one-way valve assembly in the lower recess permitting uid ilow from the bore portion of the first body member due to downward movement of the shell member urging fluid out of the second longitudinal bore in the second body member for movement in the well casing exteriorly of said shell.

4. In a fluid pump as set forth in claim 3 wherein the second longitudinal bore in the second mentioned body member extends upwardly in angular relationship relative to the longitudinal axis of said second body member for causing an upward swirling action to fluid being pumped through the well casing.

No references cited. 

